塑料光纤在裂缝监测中应用的可行性研究

发布时间：2018-05-19 03:43

本文选题：塑料光纤(POF) + 混凝土裂缝　；参考：《光电子.激光》2014年10期

【摘要】：针对普通石英光纤断裂应变较小在实际工程应用中易发生断裂的问题,本文提出在结构裂缝监测工作中运用塑料光纤(POF)代替普通石英光纤,设计了由光源、POF及光功率计组成的塑料光纤裂缝传感装置,并通过裂缝模拟装置对纤芯直径分别为0.25mm及0.5mm的POF在裂缝监测中应用的可行性进行了验证。实验结果表明,裂缝开度为0到6mm范围内,两种型号POF内部光的强度随裂缝扩展呈现逐渐减弱的变化,裂缝开展初期光强度变化明显,当裂缝宽度趋近于6mm时变化逐渐减弱,符合理论规律,且光纤直径较大时光强度变化更明显。因此POF可以有效感知裂缝的扩展,且光纤直径较大时对裂缝感知更敏感,将其应用在结构裂缝监测工作中是可行性的。
[Abstract]:In order to solve the problem that the fracture strain of ordinary quartz fiber is small in practical engineering application, this paper puts forward that the plastic fiber POF is used to replace the ordinary quartz fiber in the structural crack monitoring work. A plastic fiber crack sensing device composed of light source POF and optical power meter is designed. The feasibility of the application of POF with core diameter of 0.25mm and 0.5mm in crack monitoring is verified by the crack simulation device. The experimental results show that in the range of 0 to 6mm, the internal light intensity of the two types of POF decreases gradually with the crack propagation, the light intensity changes obviously at the initial stage of crack development, and weakens gradually when the crack width approaches to 6mm. It accords with the theoretical rule, and the change of optical fiber intensity is more obvious when the diameter of fiber is larger. Therefore, POF can effectively detect the crack propagation, and the larger fiber diameter is more sensitive to crack sensing, so it is feasible to apply it to structural crack monitoring.
【作者单位】：河海大学水利水电学院水文水资源与水利工程科学国家重点实验室;
【基金】：国家自然科学基金(51379068、51139001) 江苏省杰出青年基金(BK20140039) 新世纪优秀人才支持计划(NCET-11-0628) 高等学校博士学科点专项科研基金(20120094110005) 中央高校基本科研业务费(2012B07214)资助项目
【分类号】：TU37;TN253

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